James b



(ModeL) I J. B. HARRIS, Jr.

FLOORGRINDING MAUHINE. No. 336,918. Patented-Mar. Z, 1886.

WITNESSES: I INVENTOR ATTORNEYS.-

NITED STATES PATENT OFFICE.

FLOOR-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 336,918, dated March 2, 1886.

Application tiled December 12, 1884. Serial No. 150.205. (ModeL) To all whom it may concern.-

Be it known that I. JAMES B. HARRIS, J r.. of Geneseo, in the county of Livingston and State of New York, have invented a new and Improved Floor-Grinding Machine, of which the following is a full, clear, and exact description.

My improved grinding-niachine is especially intended for leveling the floors of skating-rinks, but may be used for abrading or leveling surfaces wherever such work is required.

The invention consists in the combination of a grinding wheel or block with a frame by which the block can be drawn, the frame also carrying a seat for the operator, that is arranged so that the weight can be thrown upon the grinding-wheel to cause its rotation in either direction, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional elevation of the machine. Fig. 2 is a plan View, and Fig. 3 is a rear elevation.

The grinding wheel or block A maybe of any suitable size, and foruied'of stone, emery, or any suitable composition. On its upper side is attached a hub, B. that is formed with a vertical stud or post,,O. Upon the post 0 is a cross bar or axle, D, on the ends of which are wheels or rollers E, that bear upon the grinding-wheel. Upon the axle is fastened a seat, F, and to the axle and seat is attached a tongue, G, having ahook, H, for attachment of the whiffletree or other means by which the machine is to be drawn along.

I is a foot-rest upon the tongue.

In the operation, the operatorisitting upon the seat, by throwing his weight to one side or the other brings the Wheel E at one side into contact with the grinding-wheel, thereby causing a greater amount of friction between the wheel and the floor at that side, so that the grinding-wheel is revolved in one direction, and by throwing the weight to the 0pposite side the grinding-wheel is caused to rotate in the opposite direction. Vhen the operator sits in the middle, the grinding wheel or'block will simply be moved along without rotation.

In order to allow the rocking movement of the axle, as described, to give the pressure, it.

is fitted loosely upon thepost O. In this manner skating or other surfaces can be readily and thoroughly ground down to a uniform level.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is-

1. The grinding-machine consisting of the wheel or block A, the axle D, carrying rollers at its ends, the tongue G, and the seat F, combined for operation substantially as described.

2. In a floor-grinding machine, the combination, with the grinding block or Wheel, of an axle mounted to rock upon the wheel, and provided with a seat for the operator, substantially as described.

3. In a floor-grinding machine, the combination, with the wheel or block A, provided with the vertical post or stud O, of the axle D, mounted upon said post 0, and the rollers E, 'journaled upon the ends of said axle, substantially as described.

JAMES B. HARRIS, JR.

\Vitnesses:

MYRON H. FOSTER, W. S. JONES. 

